Mattress bed cushion



FIG. 1 is a top perspective view of an exemplary mattress bed cushion;

FIG. 2 is a top view of the mattress bed cushion of FIG. 1, and a bottom view is identical thereto;

FIG. 3 is a left side view of the mattress bed cushion of FIG. 1, and a right side view is identical thereto; and,

FIG. 4 is a front view of the mattress bed cushion of FIG. 1, and a rear view is identical thereto.

The mattress bed cushion is shown with symbolic breaks in its length and width. The appearance of any portion of the article between the break lines forms no part of the claimed design. Broken lines in the drawings are for illustrative purposes only and do not form part of the claimed design. 

CLAIM The ornamental design for mattress bed cushion, as shown and described. 